In the April 14 edition of Nature Jin Meng and colleagues published a paper on the mammalian transitional middle ear.
Meng, Jin, Yuanqing Wang, Chuankui Li. 2011. Transitional mammalian middle ear from a new cretaceous Jehol eutriconodont. Nature 472: 181-185.
In the same issue Paul K. Strother and colleagues published on the earliest evidence for non-marine eukaryotes.
Strother, Paul K., Leila Battison, Martin D. Brasier, and Charles H. Wellman. 2011. Earth's earliest non-marine eukaryotes. Nature 472: 1-5. (the page numbers are probably wrong, my download said this was in volume 000).
